the main corrosion protection measures of steel products as follow:1.corrosion protection paint, 2.PE-cover (in case of steel tube piles), 3.zinc coating, 4.electro-chemical (cathodic) protection5.cement or concrete cover.http://www.ground-screw.com/f636932/13The+corrosion+protection+measures+of+steel.htmwww.ground-screw.com